package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * Version 3.0  升级   双向链接【客户端与服务器相互说话】
 *
 *
 */
public class Server {
    private ServerSocket serverSocket;
    public Server(){
        try {
            serverSocket=new ServerSocket(6666);
        } catch (BindException e) {
            System.out.println("端口号重复申请，建议换个端口号");
        }catch (IOException e) {
            System.out.println("申请端口号失败...");
        }
    }
    public void start() {
        try {
            while (true) {
                System.out.println("---等待客户端链接---");
                Socket socket=serverSocket.accept();
                String ip=socket.getInetAddress().getHostAddress();
                System.out.println(ip+"客户端连接成功了");
                //优化代码行数：CS多线程类：处理多个客户端
                new Thread(new CS(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开");
        } finally {//一定会被执行代码段，关闭服务器端通讯类
        //判断条件：判断服务器端通讯不为空并且判断对象是否未关闭
            if (serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }
            //找Server类中：CS多线程类--run方法--关闭socket
        }
    }
    public static void main(String[] args) {
        new Server().start();
    }

    private class CS implements Runnable{
        private Socket socket;
        private String ip;

        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }
        public void run() {
        //  BufferedReader br=null;
            PrintWriter pw=null;
            try{
                //1.读入定义
                BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
                //2.定义写出
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
                //1.1读入功能：存线程中
                new Thread(()->{
                    try {
                        String message;
                        while ((message= br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败");
                    }
                }).start();
                //2.1 提供写的方法：控制台输入
                Scanner input=new Scanner(System.in);//后台卡住
                while (true){
                    System.out.println("服务器请输入：");
                    String say=input.nextLine();
                    //打印：服务器端说的文本---打印客户端
                    pw.println("服务器说"+say);
                }
                }catch(NullPointerException e) {
                    System.out.println("IO流传入对象，有对象为null，立马核对，建议：查看try块中对象可能赋值为null");
                }catch (UnsupportedEncodingException e) {
                    System.out.println("客户端或者服务器端：字符集不一致");
                }catch (IOException e) {
                    System.out.println("通讯过程中，传输出现问题");
                } finally { //一定执行代码块：关闭流
                  /*  if(br!=null)
                        try {
                            br.close();
                        } catch (IOException e) {
                            System.out.println("结束通讯：关闭失败");
                        }*/
                    if (socket!=null&&!socket.isClosed())
                        try {
                            socket.close();
                        } catch (IOException e) {
                            System.out.println("通讯关闭失败");
                        }


            }

        }
    }
}
